/*
 *  call-seq:
 *     dtable.modulo!(number)       ->  dtable
 *     dtable.mod!(number)          ->  dtable
 *     dtable.modulo!(other)        ->  dtable
 *     dtable.mod!(other)           ->  dtable
 *  
 *  When argument is a number, this operation returns a copy of _dtable_ with each entry x replaced by x % _number_.
 *  When argument is a data array, this operation returns a copy of _dtable_ with each entry x replaced
 *  by x % the corresponding entry in the _other_ data array.
 */ VALUE dtable_modulo_bang(VALUE ary, VALUE arg) {